ORGANIC CHEMISTRY Chapter l o 1.4 Chemical Bonds: The octet Rule(八偶规则) o lonic Bonds o Covalent Bonds o 1.5 Writing Lewis Structures o 1.6 Exceptions to the Octet Rule °17 Formal charge(形式电荷) Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 1.4 Chemical Bonds: The Octet Rule（八偶规则） Ionic Bonds Covalent Bonds 1.5 Writing Lewis Structures 1.6 Exceptions to the Octet Rule 1.7 Formal Charge（形式电荷）